Angle-spacing attachment for multiple-punching machines



Feb. 19, 1929. 1,702,740

H. w. M MILL AN ANGLE SPACING ATTACHMENT FOR MULTIPLE PUNCHING MACHINES Filed Aug. 1, 1927 FIG-.2

FIGI

INVENIOR HERBER'EWMQMILLAN ATTORNEYS Patented F b. 19, 1929.

HERBERT W. MGMILLAN, or LACKINE, QUEBEC, cannula.

ANGLE-SPACING ATTACHMENT FOR MULTIPLE-PUNCHING MACHINES.

' Application filed August 1, 1927. Serial No. 209,923.

This invention relates to new and usefulv improvements in multiple punching machine attachments, and the object of the invention isto provide an attachmentthat mayv be readily and easily applied to a punching ma- .chine to facilitate the punching ofholes simultaneously in a plurality of angles, or the like, and at specified gauge distances from the sides or edges thereof.

Accordin plurality of stripper blocks which are mounted on the base of the machine in spaced relation, said blocks being apertured to allow forthe passage therethrough of the punches which pass through the material in the stripper blocks into die blocks secured to the base directly below the punches. Spring controlled jaw clamps are mounted on the base between the stripper blocks, and are adapted,

when openedby means of plungers operating in conjunction with. the punches, to press against the material being punched,to force the edges of same remote/from the jaws against the inner surfaces of the stripper blocks, or guides, so that the holes are punched at constant predetermined gauge distances from the edges of the material. The material is supported on cushioning rollers to enable it to slide easily through the machine and clear of the die blocks. The cushioning rollers also allow the material to rest on the dies,

before the punch pierces the material.

In the drawings which show one form of my invention; j

Figure 1 is a side elevation of my improved attachment secured to a punching machine.

Figure 2 is a front elevation of the machine shown in Figure 1.

Figure 3 is an enlarged side elevation of the jaw clamps.

Figure 4 is an end elevation of the jaw clamps.

Figure 5 is a support.

Figure support.

Referring more particularly to the drawings, 11 designates the body of the punching machine, or press, and 12 the base which is provided with convenient slots 13 for holding the stripper blocks 14, 15 and 16, the die blocks 17, and the clamp bases 18, in position. The punch holders 19 and punches 20 are mounted in the head 21 to reciprocate in the usual manner to pierce the work passing through the machine. In the drawing eight side elevation of the work 6 is an end elevation of the work 0 to my invention 1 provide a punched is shown as angles 22.

The punches are so positioned in the head that two holes are punched in each angle.

The legs 23 of'the outer angles face outwardly from the ce'ntreof the machine, while the legs 24 of the inner angles face towards the centre of the machine. The vertically disposed legs of all the angles are preferably projecting upwardly from the base. Plungers 25 are secured to the machine and move-in unison with the punches; These plungers are placed midway between the adjacent legs of the angles. Mounted on the base of'the machine directly below the plungers, are the clamping members which each comprise two jaws 26 and 27, pivotally mounted on pins 28 passing through base members 29, which are secured to the base of the machine. The lower end 30 of the plungers are preferably tapered and fit into recesses 31 formed'in the adjacent faces of the jaws. The downward movement of the plungers opens the ,jaws to force same. ners of the'angles. The stripper block 14 is adapted to overlie the adjacent legs of the against the adjacent corcentral angles, while stripper blocks 15 and 16 overlie thehorizontally disposed legs of the outer angles. The overlying parts of the stripper blocks are connected to their bases by ribs 32, which act as stops for the toes of the angles when they are forced apart by the jaws. Springs 33 may be provided to bring the aws into their closed position. Stop pins 34 may be provided to position the jaws in their relative closed position. Each of the end strippers is preferably made with adjustable stops or bolts 35 to facilitate the setting up of the strippers on the machine.

in the machine in the manner shown in Figure 1, that is resting on the cushion supports shown in detail in Figures 5 and 6,

a series of angles as the work and comprising rollers 36 rotatably mounted v on pins 37 passing through eye bolts 38 having shoulders 39 resting on compression I springs 40 mounted on brackets 41 secured to the bed of the machine at the feed or entrance end thereof. 'Just before the punches pierce the angles, the clamping jaws are forced apart by the plunger, thereby pressing the work against the closed ends of the stripper blocks, thus ensuring that the holes are at the correct gauge while the punches descend and pierce the work. The punches are withdrawn from the work before the clamping jaws are released leaving the work tree to be moved along into position for the next set of holes. The rollers facilitate movement of the work and, being mounted on cushioning members, allow the angles, or work, to be pressed on to a solid base such as the dies, before the punches pierce the metal.

it will be seen that the attachment is easily and conveniently mounted on the machine and facilitates he punching of a plurality of holes in a number of angles at a predeter mined distance from the sides thereof, without the necessity oi? marking off the holes, a method usually employed by structural engineers.

Having thus described my invention, what I claim is 1. in combination with a multiple punching machine for punching structural ma terial, such as angles, and the like, a plurality oi stripper blocks secured to the base 01 the machine to hold the material while the punches are being operated, clamping devices adapted to position the material in the stripper blocks, said clamping devices each comprising a pair of aws pivotally mounted on the base and a raminoving in conjunction with the punches to open the jaws and to cause them to contact with the material and hold same in the stripper blocks, while the punches are descending and lifting clear of the material.

2. In combination with a metal punching machine for punching holes in structural angles, and the like, said machine having stripper blocks attached thereto, a bracket secured to the base, clamping devices between the stripper blocks, said clamping devices each comprising a pair of jaws pivotally mounted on the bracket secured to the base, means to normally hold the jaws intheir closed relative position, and a ram operating in conjunction with the punches to open said jaws so that they force the material into the stripper blocks and hold said material in position while the material is being punched, and while same is being released from the punches.

3. In combination with a punching ma chine for punching a plurality of structural shapes, such as angles and the like, said machine having a plurality of stripper blocks attached to its base, a plurality of clamping devices secured to the base between the stripper blocks, said clamping devices each comprising a pair of pivotally mounted aws secured by suitable means to the base, means for holding them in their normally relative closed position, rams working in conjunction with the punches and adapted to open the jaws and cause same'to force the shapes and hold same in the'stripper blocks during the punching operation, and means to flexibly support the material while being punched and to raise same clearot' the base after the punching operation.

In witness whereof, I have hereunto set my hand.

HERBERT W. MGMILLAN. 

